Reclaim

Sacrifice

Burnt eel is the result of accidentally burning a slimy eel while attempting to make a cooked slimy eel. Cooking a cooked slimy eel requires 28 Cooking, and burning it will become less common with a higher Cooking level.

The burnt eel has no use whatsoever. Unlike most burnt food, it is not tradeable, and does not have an "Eat" option.